Fix a comment to match the implementation

llvm-svn: 206298
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index cea1c26..79794b1 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -8623,7 +8623,7 @@
     return;
   }
 
-  // Require an abstract type.
+  // Require a non-abstract type.
   if (RequireNonAbstractType(VD->getLocation(), Ty,
                              diag::err_abstract_type_in_decl,
                              AbstractVariableType)) {